| 摘要 |
<p>The identification-pulse detector counts the oscillations of the carrier frequency synch. signal line by line and produces a pulse when a given count is exceeded or not attained. This pulse is used as the identification pulse. The counter is a presettable backwards counter whose clock input receives the sync. signal. Its data inputs receive a binary signal corresp. to the given count, while its set input receives horizontal pulses. The carry output produces the identification pulse.</p> |
